Mirror actuation design for the interferometer control of the KAGRA gravitational wave telescope

Yuta Michimura , Tomofumi Shimoda , Takahiro Miyamoto , Ayaka Shoda , Koki Okutomi , Yoshinori Fujii , Hiroki Tanaka , Mark A. Barton

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Ryutaro Takahashi Yoichi Aso Tomotada Akutsu Masaki Ando Yutaro Enomoto Raffaele Flaminio Kazuhiro Hayama Eiichi Hirose Yuki Inoue Takaaki Kajita Masahiro Kamiizumi Seiji Kawamura Keiko Kokeyama Kentaro Komori Rahul Kumar Osamu Miyakawa Koji Nagano Masayuki Nakano Naoko Ohishi Ching Pin Ooi Fabi\'an Erasmo Pe\~na Arellano Yoshio Saito Katsuhiko Shimode Kentaro Somiya Hiroki Takeda Takayuki Tomaru Takashi Uchiyama Takafumi Ushiba Kazuhiro Yamamoto Takaaki Yokozawa Hirotaka Yuzurihara

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classification ⚛️ physics.ins-det gr-qcphysics.optics

keywords actuationcontrolinterferometerkagragravitationallengthmirrormodel

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KAGRA is a 3-km cryogenic interferometric gravitational wave telescope located at an underground site in Japan. In order to achieve its target sensitivity, the relative positions of the mirrors of the interferometer must be finely adjusted with attached actuators. We have developed a model to simulate the length control loops of the KAGRA interferometer with realistic suspension responses and various noises for mirror actuation. Using our model, we have designed the actuation parameters to have sufficient force range to acquire lock as well as to control all the length degrees of freedom without introducing excess noise.

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Mirror actuation design for the interferometer control of the KAGRA gravitational wave telescope

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